【单选题】【消耗次数：1】
作图法所依据的原理是（ ）原理，通常称为反转法。
①
相对运动
②
等加速运动
③
从动件运动
④
简谐运动
参考答案：
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【单选题】
机构具有确定相对运动的条件是（? ）。
①
机构的自由度数目大于主动件数目
②
机构的自由度数目大于或等于主动件数目
③
机构的自由度数目小于主动件数目
④
机构的自由度数目等于主动件数目
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